1-228157866-C-G

Position:

• chr1-228157866-C-G

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2 PP3_Strong PP5_Moderate

The NM_020435.4(GJC2):​c.108C>G​(p.Ile36Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. I36I) has been classified as Benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: GJC2 NM_020435.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: -1.49

Genes affected

GJC2 (HGNC:17494): (gap junction protein gamma 2) This gene encodes a gap junction protein. Gap junction proteins are members of a large family of homologous connexins and comprise 4 transmembrane, 2 extracellular, and 3 cytoplasmic domains. This gene plays a key role in central myelination and is involved in peripheral myelination in humans. Defects in this gene are the cause of autosomal recessive Pelizaeus-Merzbacher-like disease-1. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.983
• PP5: Variant 1-228157866-C-G is Pathogenic according to our data. Variant chr1-228157866-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 2078.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr1-228157866-C-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GJC2	NM_020435.4	c.108C>G	p.Ile36Met	missense_variant	2/2	ENST00000366714.3	NP_065168.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GJC2	ENST00000366714.3	c.108C>G	p.Ile36Met	missense_variant	2/2	1	NM_020435.4	ENSP00000355675	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 37

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary spastic paraplegia 44 Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Institute of Human Genetics Munich, Klinikum Rechts Der Isar, TU München	Nov 13, 2020	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Feb 01, 2009	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.62
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.36
CADD	Benign	12
DANN	Benign	0.94
DEOGEN2	Uncertain	0.78	D
Eigen	Benign	-0.96
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.082	N
LIST_S2	Uncertain	0.92	D
M_CAP	Pathogenic	0.85	D
MetaRNN	Pathogenic	0.98	D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Uncertain	2.0	M
MutationTaster	Benign	0.73	D
PrimateAI	Pathogenic	0.83	D
PROVEAN	Uncertain	-2.9	D
REVEL	Uncertain	0.63
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.80
MutPred		0.89		Gain of catalytic residue at V32 (P = 0.0435);
MVP		0.93
ClinPred		0.97	D
GERP RS		-6.3
Varity_R		0.76
gMVP		0.90

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs75469429; hg19: chr1-228345567;